Crowds gather on a nearby hillside to watch as the thirteen story tall Warren Hall building on the Cal State University East Bay campus is prepared to be imploded in Hayward, Ca., Saturday August 17, 2013.

Photo: Michael Macor, San Francisco Chronicle

Crowds gather on a nearby hillside to watch as the thirteen story...

Crowds gather on a nearby hillside to watch as the thirteen story... Photo-5057051.68381 - SFGate

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Warren Hall Implosion

Media: San Francisco Chronicle

Warren Hall Implosion Media-84335.68381 - SFGate

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CSU East Bay Implosion Triggers Fake Quake Item-23205.68381 - SFGate

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Crowds gather on a nearby hillside to watch the implosion as the thirteen story tall Warren Hall building is prepared to be demolished on the Cal State University East Bay campus, in Hayward, Ca., Saturday August 17, 2013.

Photo: Michael Macor, San Francisco Chronicle

Crowds gather on a nearby hillside to watch the implosion as the...

Crowds gather on a nearby hillside to watch the implosion as the... Photo-5057042.68381 - SFGate

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Crowds prepare for the implosion with ear protection as they gather on a nearby hillside to watch as the thirteen story tall Warren Hall building demolition on the Cal State University East Bay campus, in Hayward, Ca., Saturday August 17, 2013.

Photo: Michael Macor, San Francisco Chronicle

Crowds prepare for the implosion with ear protection as they gather...

Crowds prepare for the implosion with ear protection as they gather... Photo-5057043.68381 - SFGate

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The initial charges are deployed as crowds gather on a nearby hillside to watch as the thirteen story tall Warren Hall building on the Cal State University East Bay campus is imploded in Hayward, Ca., Saturday August 17, 2013.

Photo: Michael Macor, San Francisco Chronicle

The initial charges are deployed as crowds gather on a nearby...

The initial charges are deployed as crowds gather on a nearby... Photo-5057040.68381 - SFGate

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Crowds gather on a nearby hillside to watch as the thirteen story tall Warren Hall building on the Cal State University East Bay campus is imploded in Hayward, Ca., Saturday August 17, 2013.

Photo: Michael Macor, San Francisco Chronicle

Crowds gather on a nearby hillside to watch as the thirteen story...

Crowds gather on a nearby hillside to watch as the thirteen story... Photo-5057054.68381 - SFGate

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Crowds gather on a nearby hillside to watch as the thirteen story tall Warren Hall building on the Cal State University East Bay campus is imploded in Hayward, Ca., Saturday August 17, 2013.

Photo: Michael Macor, San Francisco Chronicle

Crowds gather on a nearby hillside to watch as the thirteen story...

Crowds gather on a nearby hillside to watch as the thirteen story... Photo-5057058.68381 - SFGate

Image 9 of 25

Crowds gather on a nearby hillside to watch as the thirteen story tall Warren Hall building on the Cal State University East Bay campus is imploded in Hayward, Ca., Saturday August 17, 2013.

Photo: Michael Macor, San Francisco Chronicle

Crowds gather on a nearby hillside to watch as the thirteen story...

Crowds gather on a nearby hillside to watch as the thirteen story... Photo-5057059.68381 - SFGate

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Crowds gather on a nearby hillside to watch as the thirteen story tall Warren Hall building on the Cal State University East Bay campus is imploded in Hayward, Ca., Saturday August 17, 2013.

Photo: Michael Macor, San Francisco Chronicle

Crowds gather on a nearby hillside to watch as the thirteen story...

Crowds gather on a nearby hillside to watch as the thirteen story... Photo-5057057.68381 - SFGate

Image 11 of 25

Crowds gather on a nearby hillside to watch as the thirteen story tall Warren Hall building on the Cal State University East Bay campus is imploded in Hayward, Ca., Saturday August 17, 2013.

Photo: Michael Macor, San Francisco Chronicle

Crowds gather on a nearby hillside to watch as the thirteen story...

Crowds gather on a nearby hillside to watch as the thirteen story... Photo-5057056.68381 - SFGate

Image 12 of 25

Crowds gather on a nearby hillside to watch as the thirteen story tall Warren Hall building on the Cal State University East Bay campus is imploded in Hayward, Ca., Saturday August 17, 2013.

Photo: Michael Macor, San Francisco Chronicle

Crowds gather on a nearby hillside to watch as the thirteen story...

Crowds gather on a nearby hillside to watch as the thirteen story... Photo-5057041.68381 - SFGate

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Dust rises as crowds gather on a nearby hillside to watch as the thirteen story tall Warren Hall building on the Cal State University East Bay campus is imploded in Hayward, Ca., Saturday August 17, 2013.

Photo: Michael Macor, San Francisco Chronicle

Dust rises as crowds gather on a nearby hillside to watch as the...

Dust rises as crowds gather on a nearby hillside to watch as the... Photo-5057055.68381 - SFGate

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Dust rises as crowds gather on a nearby hillside to watch as the thirteen story tall Warren Hall building on the Cal State University East Bay campus is imploded in Hayward, Ca., Saturday August 17, 2013.

Photo: Michael Macor, San Francisco Chronicle

Dust rises as crowds gather on a nearby hillside to watch as the...

Dust rises as crowds gather on a nearby hillside to watch as the... Photo-5057039.68381 - SFGate

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Dust rises as crowds gather on a nearby hillside to watch as the thirteen story tall Warren Hall building on the Cal State University East Bay campus is imploded in Hayward, Ca., Saturday August 17, 2013.

Photo: Michael Macor, San Francisco Chronicle

Dust rises as crowds gather on a nearby hillside to watch as the...

Dust rises as crowds gather on a nearby hillside to watch as the... Photo-5057052.68381 - SFGate

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The thirteen story tall Warren Hall building is imploded leaving a pile of rubble on the Cal State University East Bay campus is imploded in Hayward, Ca., Saturday August 17, 2013.